Fares are around $484 round-trip from United hubs on American and from American hubs on United. These prices are available for departures as early as Monday, January 15. Travel Monday, Tuesday, Wednesday, or Thursday to find these fares with departures from the USA through mid-February and again from April through early June.
These deals typically don't last too long so book fast if something catches your eye. Hong Kong is a great destination on its own, but can also be used as a jumping off point for cheap flights in the region.
For a complete list, view our page for flights to Hong Kong.